Earnings Per Share - Schedule of Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net income	$ 851,928	$ 667,434	$ 1,571,990	$ 2,107,457
Basic weighted-average common shares outstanding (in shares)	257,876	260,392	258,740	260,313
Effect of potentially dilutive securities:
Employee stock purchase program (in shares)	19	12	10	17
Diluted weighted-average common shares outstanding (in shares)	259,707	264,079	260,877	264,031
Basic net income per common share (in dollars per share)	$ 3.30	$ 2.56	$ 6.08	$ 8.10
Diluted net income per common share (in dollars per share)	$ 3.28	$ 2.53	$ 6.03	$ 7.98
Stock options
Effect of potentially dilutive securities:
Share-based payment arrangements (in shares)	971	1,887	1,124	1,936
Restricted stock units (including PSUs)
Effect of potentially dilutive securities:
Share-based payment arrangements (in shares)	841	1,788	1,003	1,765